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Long-term Debt (Details)
$ in Millions
6 Months Ended
Feb. 24, 2015
USD ($)
agreement
aircraft
Oct. 01, 2014
USD ($)
aircraft
Jun. 30, 2015
USD ($)
aircraft
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 185.0 $ 379.0    
Long-term Debt, Gross     $ 435.8 $ 148.0
Number of Facility Agreements | agreement 2      
Repayments of Long-term Debt     8.2  
Framework Agreement [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross     259.0  
Facility Agreement [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross     185.0  
Senior Loans [Member]        
Debt Instrument [Line Items]        
Debt instrument, term 12 years 12 years    
Long-term Debt, Gross     387.2 132.0
Junior Loans [Member]        
Debt Instrument [Line Items]        
Debt instrument, term 7 years 7 years    
Long-term Debt, Gross     $ 48.6 $ 16.0
A320 [Member] | Airbus [Member]        
Debt Instrument [Line Items]        
Number of Aircraft with Secured Debt Financing Commitments Scheduled for Delivery | aircraft 5 7    
A320 [Member] | Airbus [Member] | Framework Agreement [Member]        
Debt Instrument [Line Items]        
Number of Delivered Aircraft with Secured Debt Financing Commitments | aircraft     7  
A320 [Member] | Airbus [Member] | Facility Agreement [Member]        
Debt Instrument [Line Items]        
Number of Delivered Aircraft with Secured Debt Financing Commitments | aircraft     5  
A321 [Member] | Airbus [Member]        
Debt Instrument [Line Items]        
Number of Aircraft with Secured Debt Financing Commitments Scheduled for Delivery | aircraft   3    
2015 [Member] | Airbus [Member]        
Debt Instrument [Line Items]        
Number of Aircraft with Secured Debt Financing Commitments Scheduled for Delivery | aircraft     3  
2015 [Member] | A321 [Member] | Airbus [Member]        
Debt Instrument [Line Items]        
Number of Aircraft with Secured Debt Financing Commitments Scheduled for Delivery | aircraft     3